Auth bypass in Budibase
CVE-2026-54356
Budibase is an open-source low-code platform. Prior to 3.41.3, POST /api/attachments/:datasourceId/url in packages/server/src/api/routes/static.ts and packages/server/src/api/controllers/static/index.ts allows an authenticated published-app user with the BASIC role to supply attacker-controlled bucket and key values and obtain signedUrl and publicUrl values backed by stored S3 datasource credentials. This issue is fixed in version 3.41.3.
Vulnerability class: Broken Access Control
CVSS v3 metric
CVSS v3 base score 7.1 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:L.
Affected products
- Budibase — versions < 3.41.3
Weakness classification (CWE)
References
- security-advisories@github.com (x_refsource_CONFIRM)
- security-advisories@github.com (x_refsource_MISC)
Frequently asked questions
- What is CVE-2026-54356?
- CVE-2026-54356 is a high-severity vulnerability in Budibase, classified under Missing Authorization. CVSS score: 7.1/10. Published 2026-08-17.
- How severe is CVE-2026-54356?
- High severity. CVSS v3 base score is 7.1 out of 10.